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Book now at the podcast show London.com. I'm John Baxter. Natural law. I welcome someone to help us understand natural law in the 21st century. Samuel Gregg writing at Civitas Outlook, part of Civitas Institute.

Sam is a contributing editor to the Civitas Outlook at the University of Texas.

His day job, however, is the Frederick Hayek Chair in Economics and Economic History,

at the American Institute for Economic Research.

And he's now going to take us 2,500, 3,000 years ago, at least.

That's the philosophy of natural law.

That's how old it is.

But it is about to be updated.

Sam, a very good evening to you.

Thank you for this.

A definition.

What is natural law, as we understand it in the 21st century? Good evening to you.

Well, thanks very much, John. It's great to be with you. So as you said, natural law is at least

2,500 years old. I would argue it probably goes back even further. But it's a philosophical way

of understanding the world. It may maybe the philosophical tradition that is most

...